Photo: PopePompus · CC BY-SA 4.0Living in St. Marys, IA: what to set up and who to call
Tap water in St. Marys comes from Saint Marys Water Corporation, which has a clean five-year EPA record (about 23% of systems its size had a health-based violation) and a latest lead result below detection. Public schools here are run by Martensdale-St. Marys Community School District.
I’m new in town
What to set up in St. Marys, and who provides it. Tap an answer for the details and where they come from.
Power, water and internet
Who to call to start service at a new address in St. Marys.
Power comes from MidAmerican Energy
MidAmerican Energy (MidAmerican Energy Co), an investor-owned utility, serves all of St. Marys. Its homes paid an average of 11.2¢ per kWh in 2025, about $93 a month (its average across Iowa).
Start or move service: midamericanenergy.com · (888) 427-5632
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Saint Marys Water Corporation
Saint Marys Water Corporation supplies almost all of St. Marys. It buys treated surface water (EPA lists Warren Water District as seller) and serves 121 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 77% of the 15,074 systems serving 101–500 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, was 0.0 ppb, below the 15 ppb action level that applied. Results below detection are reported as 0, so 0 doesn’t mean no lead at any tap.
The system’s full record: EPA ECHO report
EPA SDWIS via Envirofacts (violations pulled Oct 9, 2026) and ECHO (lead samples, 2026Q3); service area: EPA Community Water System Service Area Boundaries v3.0 (EPA’s estimate). Violations are counted by the start of their compliance period. IA9176019.
2 home internet providers serve St. Marys
100% of 61 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| OmniTel | Fiber | 100% | 8,000/8,000 |
| Verizon | Fixed wireless | 28% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have St. Marys’ trash rules yet
Pickup rules, the dump and recycling in St. Marys.
Where your child goes to school
Public school districts and the school path by grade.
St. Marys is in Martensdale-St. Marys Community School District.
Test scores and every school: see Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Sep 2026; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
St. Marys is in ZIP code 50241
ZIP codes where St. Marys residents live, with the share of the town in each.
| ZIP | Post office name | Share of St. Marys | ZIP’s residents in St. Marys |
|---|---|---|---|
| 50241 | Saint Marys, IA | 100% | 100% |
Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.
Getting around, the ER and the library
One line each; the subject pages have the rest.
ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in St. Marys
Who supplies St. Marys’ drinking water, and has it had violations?
Saint Marys Water Corporation (EPA ID IA9176019). It reported no health-based violations to EPA in the five years to October 2026; 77% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in St. Marys?
MidAmerican Energy (MidAmerican Energy Co), an investor-owned utility. Its homes paid about 11.2¢ per kWh in 2025 (EIA).
What internet providers serve St. Marys?
OmniTel, Verizon (FCC, as of December 2025).
What ZIP codes are in St. Marys?
50241. Census 2020 ZIP Code Tabulation Areas.
What school district is St. Marys in?
Martensdale-St. Marys Community School District.
How do I register to vote in St. Marys?
In Iowa you can register online until 15 days before Election Day, in person up to and including Election Day, or by mail (postmarked 15 days before). Elections here are run by the Warren County Auditor. Check your registration at sos.iowa.gov.
Sources & dates
Every answer above names its source. Here they are with their dates.
- Water: EPA SDWIS (Envirofacts, pulled Oct 9, 2026), ECHO SDWA 2026Q3, EPA CWS Service Area Boundaries v3.0.
- Power: HIFLD Electric Retail Service Territories (map Aug 2023); EIA-861 final 2025.
- Trash: OpenStreetMap, Geofabrik extract of Oct 9, 2026. © OpenStreetMap contributors (ODbL).
- ZIP codes: Census 2020 ZCTA relationship files; GeoNames postal codes (CC BY 4.0).
- Schools: NCES Common Core of Data, 2024–25.
- Registration: vote.gov, updated Nov 18, 2024 (read Oct 10, 2026). Official sites and area codes: Wikidata.
- Election office: FVAP local election office directory (fetched Oct 10, 2026; each record dated), EAC EAVS 2024 jurisdictions; registration and lookup links from vote.gov’s state data, checked Oct 10, 2026.
- Internet: FCC National Broadband Map, as of December 2025.